Furnace block



May 12, 1931- l R. SHELLENBERGER 1,804,957

FURNACE BLOCK Filed March '7. 1928 .I I "lll,

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y '-PUI i l i J LAF@ L/ 2 F1614 lNvENroR ATTORNEY:

Patented May y12, 193i nNrrEn siufrssV PATENT oFricE-d noLrn SHELLENBERGER, or BETHLEHEM, PENNSYLVANIA, yAssIGrNoR 'ro FULLER LEHIGH COMPANY. oP PULLERTON, PENNSYLVANIA, A CORPORATION oP DELA;

WARE

Application led March 7',

This invention relates to a block or tile that is especially useful for furnace walls that are provided with Water cooling tubes. The block is made up of a metallic portion 5 that contacts with the tubes and a refractory portion that is held in a recessA in the metal portion by meansof cement. Y

The invention will be understood from the description in connection with the accomlo panying drawings in which Fig. 1 is a vsectional elevation of one of the blocks; Fig. 2

. is a section at right angles to that shown in Fig. 1; Fig. 3 is a section of a wall showing the blocks in place; and Fig. 4 is a side View 1.3 of the wall. In the drawings reference character 1 indicates the metal or back portion of the block that may be made of cast iron, for example. The-'front or furnace side of the block is made of refractory material 2 20 that is'cemented in place in a recess in the metal portion. The metal portion 1 is pro vided withV a screw threaded hole 3 in the back thereof to accommodate a screw threaded bolt for keeping the block in place.

The metal or back portion l is provided with flanges 4 at the edges, thus leaving a seat or recess between the flanges. The flanges are made with their inner walls Converging, thus making the outer edges of the flanges thicker than the portion of the flanges that join the main body portion 1 of the metal block. There is thus provided a somewhat dovetail shaped seat or recess for the refractory portion of the block. The refractory 1 portion 2 of the block isv provided with an extension 6 to extend into the recess betweenv the flanges 4. The outer edges or walls 7 of the extension 6 are made to converge toward the front of the block, thus Vmaking these walls approximately parallel to the corresponding walls of the flanges 4. The width of the extension 6 is made slightly less than the distance between the flanges 4 so that spaces are left between the extension and flanges.` These spaces as well as a small PURNAGE; BLOCK v 192s.' seria1'No.259,722.f 'Y

spacebetween the faces ofthe metal andrefr'actory portions of the block, are filled with cement 8 that may be made of clay and water glass, for example, thus retaining the refrac tory portion 2 in place on the metal portion l when the cement hardens.

In the view shown in Fig. 2, the distance across the widest portion of the extension 6." is made slightly greater than the shortest distance between the flanges 4 so that one edge 55 of the refractoryportion 2 is insertedand pushed all the wayover to one side, whereupon theother edge can be inserted and the refractoryportion centered or adjusted, to equalizev the spaces on opposite sides and cement 8 keeps the refractory portion in place.

Figs'. 3 and 4 illustrate the manner in which the blocks may be installed. Reference character 10 indicates a row Aof waterfwall tubes that are spaced apart and saddles or holding members 11 extend from one tube to the next on the sideopposite the furnace. These saddles or supports 1l have rounded portions l2 that fit the outside of the tubes and' screw bolts 13 that are provided with nuts l14 extend through the saddles or supports 11 into theholes 3 in the blocks so that Vwhen the nuts 14 are tightenedthe'metal portions'of the blocks will`be securely clamped against the tubes. The metal portions of the blocks are provided with rounded portions 15 to lit the tubes. f ,Y I

It has been found that decided advantages are obtained by cementing the refractory por- 5&0 tions to the metal portions'instead of casting the metal portion in place as has heretofore been done. Thel heat conductivity of' the cement being small, a higher `temperature is obtained on the furnace side of the refractory I material than would be the case if the metal portions were cast in place on the refractory. This is desirable becausehightemperatures arerequired on thefurnace side `for best Vcom-- that the refractory material is less liable to spall when cemented to the metal than is when the metal is cast in place on the reA fractory. There are no initial casting strains on the refractory when the same is cemented in place as above described.

The invention is also useful, for example, when the refractory material is made of carborundum. In that case, a cement of high heat conductivity composed largely of carborundum, for example7 can be used and the danger of the refractory material spalling is decreased.Y Changes and modifications can be made without departing from the spirit or scope of the invention.

I claim:

1. A furnace wall comprising blocks,A each said backing located between each backing and refractory facing whereby the rate of heat transfer between said backings and refractory facings is reduced so as to permit a high surface ten'iperature on the side of said facings toward the furnace and relatively low temperature of the metal of said backing, and water tubes along said furnace wall to which said blocks are connected with the refractory facings of said block facing the inside of said furnace.V

RULFE SHELLENBERGER.

y having a metallic backing, refractory facings supported on said backings forming the face of a combustion chamber and covering said backings and shielding same from the heat of said furnace, a layer of relatively low heat conductive material locate-d between each backinfT and refractory facing whereby the rate or heat transfer between said,beckV A s and refractory facings is reduced so as to permit a high surface temperature on the side of said facings 'toward the furnace and relatively low temperature of the metal of said backinff.

2. In a furnace chamber, a wall comprisin aV block adapted to form a part of the wall of said furnace chamber, a metallic supporting member having a recess formed therein on the side facing said furnacechainber, a refractory block having a portion located within said recess and supgorted by said metallic member, said block covering the entire face of said member on the furnace chamber side to shield said member from the radiant heat of said furnace and a layer of relatively poor heat conductive material located between said block and said member.

3. A furnace wall comprisingblocksn each having a metallic backing refractory facings supported on said baclings forming` the face of a combustion chamber and covering said baclrings and shielding same from the heat of said furnace', a layer of mate ial whoee heat conductivity Vis low relative `to said backing located between each backing and refractory facing whereby the rate of heeft transfer between said baclings and refrad tory facings is reduced so as to permit a high surface temperature on the side of said facings toward the furnace and relatively low temperature of the metal of said bacl ing.

4. A. furnace wall comprising bloclzsa each having a n'ietallic backing, refractory facings supported on said backings forming` the face of a combustion chamber and covering said backings and shieldingr same from th heat of lsaid furnace, a layer of material whose heat conductivity is low relative to 

